FW: [Elecraft] First pass... sidetone output tests

[Dan Barker]

Tom: Do you have "good audio" or "bad audio"? Your measurements are
extremely interesting, but have no meaning without the qualitative
descriptor<g>.

Dan / WG4S / K2 #2456 - Good Audio

<snip>
                O'scope    RMS DMM      Comment
       RP7-8   0.40V p-p (88.5mV RMS)
       RP3-4   0.22V p-p (81.7mV RMS)
       RP3-6   0.20V p-p (71.5mV RMS)
       U10B-7  0.20V p-p (74.0mV RMS)
       U9-8    0.29V p-p (106.7mV RMS)   BYPASS of U9
       U9-6    0.30V p-p (107.0mV RMS)   AF OUT of U9
       Spkr    0.26V p-p (92.0mV RMS)    @ 4 Ohms load
                                   Note: I get 1.4V p-p (743 mV RMS)
                                         across the 4 Ohm SPKR output
                                         load when ST L = 255
<snip>